Is CVE-2026-115731 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-115731 being exploited in the wild.

How severe is CVE-2026-115731?

Informational severity, published 3 November 2026.

Is there a fix for CVE-2026-115731?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-115731 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-115731?

Check whether you run Puppet Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-115731: Puppet Server deserialization of untrusted data in report processing

CVE-2026-115731 · Severity: info · Published 2026-11-03

Puppet Server, a configuration management tool used to manage servers and infrastructure, contains a flaw in how it processes reports from agents. An attacker with a valid agent certificate can send a specially crafted report that executes arbitrary code on the Puppet Server with its service account privileges. In environments where certificates are automatically signed without strong verification, an unauthenticated attacker could obtain the needed certificate and achieve remote code execution.

Vendors: Puppet.

Quick answers

Is CVE-2026-115731 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-115731 being exploited in the wild.
How severe is CVE-2026-115731?: Informational severity, published 3 November 2026.
Which products and versions are affected?: Puppet Puppet Server.
Is there a fix for CVE-2026-115731?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-115731 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-115731?: Check whether you run Puppet Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a deserialization flaw in Puppet Server's report-processing code that accepts untrusted data in rich-data types submitted via PUT request. An attacker holding or obtaining a CA-signed agent certificate can exploit this to execute arbitrary code as the Puppet Server service user. Exploitation requires either a valid agent certificate or a CA that auto-signs requests without strong verification.

Affected products

Puppet Puppet Server

Timeline

2026-11-03: disclosed

References

https://portal.perforce.com/s/cve/a91Qi000003IaHpIAK/report-deserialization-code-execution

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